Name:
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Intro-Stat, Math 203 B, Quiz 1
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Females in this class reported the following values for the length of their
hair (in inches).
Female Hair Length
| 4.0 |
4.0 |
5.7 |
7.0 |
10.0 |
10.0 |
12.0 |
12.0 |
12.0 |
12.0 |
12.5 |
13.0 |
16.0 |
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Make a stem and leaf plot of this data.
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Would you use the five-number summary, or the mean and standard deviation
to describe the center and spread of this data set? Explain your choice
(but do NOT calculate the values).
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Males in this class reported the following values for the length of their
hair (in inches).
Male Hair Length
| 0.1 |
0.3 |
0.5 |
0.5 |
0.5 |
0.8 |
0.8 |
1.0 |
1.0 |
1.0 |
1.3 |
| 1.3 |
1.5 |
1.5 |
1.5 |
1.5 |
1.8 |
2.0 |
2.0 |
2.3 |
2.5 |
3.3 |
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Make a histogram of the male hair length data from this class.
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One of these data might be considered an outlier, which one?
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Remove the outlier and calculate the mean and standard deviation of this
data set (male hair length).
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The standard deviation for female hair length is 3.73 inches. Which data
set (male or female hair length) is more spread out? How do you know?
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Assume that bowling scores for the Thursday night Pella league are normally
distributed with a mean of 173 and standard deviation of 31.
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How many standard deviations below average is a bowling score of 100 (or
find the z-score of 100 in the Thursday night league)?
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What percentage of bowlers in this league score under 100?
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What percentage of bowlers score between 200 and 250?
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How high must a bowler score to be in the top 5% of this league?